Malicious PDF — malware analysis report

Static analysis result for SHA-256 9291adc5f4b6ca87…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 20:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c1c81089e8503f38029dfddd93a7eaaa SHA-1: 056c30ace02c5f241ce983009120e74884bc5739 SHA-256: 9291adc5f4b6ca873c281a9a5e13750259809710c254310aa95deb36bf8342cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories, suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/be8b66b7bd9e47bf7e820e5f07719d52/74952935318.pdf In PDF document text
    • https://purefeeling8.com/data/file/vufozobesetexebebi.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/woxitizulofofezuluko.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295658067a---nuguvuluzixepabuboke.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/56799115218.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/34116629283.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/tixogiluvad.pdfIn PDF document text
    • http://nutrizionisti.eu/public/thread/risorse/file/bimezevuvuloleka.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/wojumozixoba.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/ginuvobavesiraweg.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/1e3e8b9d469de40286f4d7c126ddd300/xijafapuj.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/xedirivotudix.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/d8k1qj6dero23bmbqrokonhtqq/95231865482.pdfIn PDF document text
    • http://industrialdevices.in/uploads/zorovudiwuninu.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/605d216b58fead6588988abc710c857c/pakijomakejiwu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1662414b4---66126803285.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078533ddb613---62648919288.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/zegopivavemu.pdfIn PDF document text
    • http://intergeored.com/upload/File/biwekamevekakod.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/42b31b6385caabb2d84d1c161b939809.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20a32cde9---33873843196.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ice+cream+and+sorbetPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/66697098306.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00C 17056 bytes
SHA-256: 80f1ab90264284f06a34f3a3ffcb5d4badb2977028d4dfd0038373dd3e73789d
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 10484 bytes
SHA-256: 600a924b9a59827c483458e3da04e78bf7653abf2fd13892641dc056e016e29e
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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